Backport: Fix lint, fmt and integration testing errors (#2553)

* Fix lint errors

* Fix fmt errors (#2544)

* Hotfix for integration testing (#2473)

* Hotfix for integration testing

models/migrations/v16.go

@@ -119,9 +119,5 @@ func addUnitsToTables(x *xorm.Engine) error {
 		}
 	}
 
-	if err := sess.Commit(); err != nil {
-		return err
-	}
-
-	return nil
+	return sess.Commit()
 }